MAS9191AJ MAS [Micro Analog systems], MAS9191AJ Datasheet - Page 3

• Manufacturer Part Number: MAS9191AJ
• Description: Single Chip AMPS/ETACS/NAMPS Audio/Data Processor
• Manufacturer: MAS [Micro Analog systems]

PIN DESCRIPTION
RXACCOUT
SIDETONE
MICSGND
Pin name
CAMP2O
BUZOUT
COMPIN
MICOUT
XRESET
EXTERP
RAUDIN
CAMP2I
EXTMIC
SIDEFB
CWCIN
BUZFB
EARP1
EARP2
MICFB
SRxD
STGT
STxD
EINR
SCL
STB
EST
MIC
Pin
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Type
AO
AO
AO
AO
AO
AO
AO
AO
AO
AO
AO
AI
AI
AI
AI
AI
AI
AI
AI
AI
AI
O
I
I
I
I
Function
Compressor 2nd amplifier input as well as GC4 input. Use an external
22nF capacitor between COUT and this pin.
Compressor window comparator input. Use an external 22nF capacitor
between CAMP2O and this pin.
Compressor 2nd amplifier output.
Compressor input. The input is connected through a 22nF capacitor to
MICOUT.
Microphone amplifier output. See COMPIN. This output is used as a
source for the side tone and for detection of the TX audio level.
Microphone signal ground. This is the internal signal ground V
appears on the microphone signal an external capacitor may be needed
between this pin and system ground.
Microphone amplifier input. Using this pin and the MICFB output the
microphone amplifier frequency response can be adjusted according to
the microphone used. The level at this input should be in the range
5..10mVrms. The maximum gain of the microphone amplifier is 30 dB.
Microphone amplifier feedback output
External microphone input. The level should be 100mVrms at 1kHz.
Master reset. Active low.
Serial interface clock input. The data is transferred in both directions at the
rising edge of this signal.
Serial interface strobe signal. With strobe signal the MAS9191A stores the
given address from the serial interface buffer and enters the data mode.
The serial interface stays in the data mode until eight SCL pulses are
received after the strobe signal.
Serial interface transmit data output.
Serial interface receive data input
Buzzer feedback is the input for the buzzer driver.
Buzzer output.
Output for external accessories
Earpiece differential outputs of earpiece amplifier. The outputs are
capable of driving a ceramic earpiece directly.
Side tone feedback output
Side tone input. The level of the side tone is controlled with external
components.
External RX input.
Steering control input for DTMF receiver. When the level at this input
changes from below V
When this occurs the DTMF tone is stored and an interrupt is generated.
Enable Steering output. This pin is high when the DTMF receiver has
detected a valid DTMF tone.
Input for filter 6. Connect through a 22nF capacitor to the expander output
(EXPOUT).
Output of uncommitted Op Amp in MAS9191A. The Op Amp is normally
used for RX audio level detection. The application circuit for this function is
in the APPLICATIONS section. Connect the level detected by the circuit
to the A/D converter of the general purpose micro controller.
DD
/2 to above V
DD
/2 the pin is pulled up internally.
DA9191A.000
July 31, 1997
DD
/2. If noise
3